Rivalry Among Competing Sellers Tends to Be More Intense When

Rivalry among competing sellers tends to be more intense when:

A) competitors vary in size and capability,such that smaller firms must really struggle to even survive.
B) buyer switching costs are high and market demand is growing rapidly.
C) several competitors are under pressure to improve their market share or profitability and launch fresh strategic initiatives to attract more buyers and bolster their business position.
D) the products of rival sellers are strongly differentiated.
E) All of these.